I am working as Head HR in an organization. Unfortunately, I had to undergo orthopedic implant surgery, and doctors advised me to take three months of rest. Practically, it became difficult for me to work. I emailed my management about my problem along with my resignation and assurance to hand over my responsibilities once I am able to walk. However, they did not accept my resignation. Instead, they emailed me stating that they want to conduct an inquiry against me for an incident that occurred one year ago where my involvement was minimal. What should I do?